#include<iostream>
const int ArSize = 80;
char * left(const char * str,int n=1);
int main()
{
	using namespace std;
	char sample[ArSize];
	cout<<"Enter a string :\n";
	cin.get(sample,ArSize);
	char *ps=left(sample,4);
	cout<<ps<<endl;
	delete [] ps;
	return 0;
}

char * left(const char * str, int n)
{
	if(n<0)
		n=0;
	char * p=new char[n+1];
	int i;
	for(i=0;i<n&&str[i];i++)
	{
		p[i]=str[i];
		
	}
	while(i<=n)
		p[i++]='\0';
	return p;
}
